111040021 has 4 divisors (see below), whose sum is σ = 115867872. Its totient is φ = 106212172.

The previous prime is 111040003. The next prime is 111040031. The reversal of 111040021 is 120040111.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 111040021 - 2⁵ = 111039989 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111040031) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2413891 + ... + 2413936.

It is an arithmetic number, because the mean of its divisors is an integer number (28966968).

Almost surely, 2^111040021 is an apocalyptic number.

It is an amenable number.

111040021 is a deficient number, since it is larger than the sum of its proper divisors (4827851).

111040021 is an equidigital number, since it uses as much as digits as its factorization.

111040021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4827850.

The product of its (nonzero) digits is 8, while the sum is 10.

The square root of 111040021 is about 10537.5528942919. The cubic root of 111040021 is about 480.6473052126.

Adding to 111040021 its reverse (120040111), we get a palindrome (231080132).

The spelling of 111040021 in words is "one hundred eleven million, forty thousand, twenty-one".